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I
I
SYMPTOM
Drift
Unsatisfactory frequency
or transient (overshoot)
response, or cannot ad-
just damping control(s)
POSSIBLE CAUSE
Drifting tube
May be drift of Perma-
paper
Drifting signal
Line voltage or fre-
quency
Inadequate warmup
Drift in high-frequency
signal component
Defective tube
Improper adjustment
Leakage
CHECK
Check all tubes
See Recorder Trouble Shootin
Chart
Check with meter and oscillo
scope.
See if baseline dril
with ATTENUATOR at OFF
Drifting widely or outside
limits can cause drift.
ChE
with meter
Warm up at least the stated
five minutes required
High-frequency components
~a.
overload the grids and still
not show on the record as a
signal.
This causes a non-
linearity, which can appear
as a drift if the high-fre-
quency component drifts. Che<
with meter and oscilloscope
Check all tubes
Re-adjust
Leakage across (or through)
R2009-C2004 or R2023-C2010.
If dirty, clean with carbon
tetrachloride or equivalent
Unsatisfactory control
of trace density
See the Recorder Trouble Shooting Chart
Noise, microphonics, or
hum
Defective tube
Defective component
Noisy signal
Loose input plug or con-
nector
Open shield connection,
or ground loop
- 4 -
Check all tubes
Check circuit with oscillo-
scope to find source of inte:
ference
Check signal with oscillosCOf
See if baseline becomes clear
with ATTENUATOR at OFF.
Plug in firmly
Check input circuit cabling
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